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This paper presents an output capacitor-less low-dropout regulator (LDO) witha bias switching scheme for biomedical applications with dual-range loadcurrents. Power optimization is crucial for systems with multiple activationmodes such as neural interfaces, IoT and edge devices with varying loadcurrents. To enable rapid switching between low and high current states, aflipped voltage follower (FVF) configuration is utilized, along with a supersource follower buffer to drive the power transistor. Two feedback loops and anon-chip compensation capacitor Cc maintain the stability of the regulator undervarious load conditions. The LDO was implemented in a 65nm CMOS process with1.5V input and 1.2V output voltages. The measured quiescent current is as lowas 3uA and 50uA for the 0-500uA and 5-15mA load current ranges, respectively.An undershoot voltage of 100mV is observed when the load current switches from0 to 15mA within 80ns, with a maximum current efficiency of 99.98%. Our designachieved a low Figure-of-Merit of 0.21ps, outperforming state-of-the-art analogLDOs.

A 0.21-ps FOM Capacitor-Less Analog LDO with Dual-Range Load Current for Biomedical Applications